| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 231-90** | (510) 231-9000 - (510) 231-9099 | 59 |
| (510) 231-91** | (510) 231-9163 - (510) 231-9199 | 25 |
| (510) 231-92** | (510) 231-9200 - (510) 231-9270 | 3 |
| (510) 231-93** | (510) 231-9351 - (510) 231-9399 | 35 |
| (510) 231-94** | (510) 231-9400 - (510) 231-9469 | 5 |
| (510) 231-95** | (510) 231-9500 - (510) 231-9593 | 6 |
| (510) 231-96** | (510) 231-9609 - (510) 231-9690 | 23 |
| (510) 231-97** | (510) 231-9763 - (510) 231-9763 | 1 |
| (510) 231-98** | (510) 231-9800 - (510) 231-9898 | 40 |
| (510) 231-99** | (510) 231-9900 - (510) 231-9999 | 69 |
US Phone Directory: (510) 231-9***
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